Well, there are those medications on TV on ads, where they ALWAYS have these "side-effects", and the MAJORITY of them include heart-pain.
I hope I helped! :-)
Answer:
natural ammunity
Explanation:
immunity possessed by a species or race that is present in an individual at birth prior to exposure to a pathogen or antigen.
Ear drum because if damaged it can cause pain and loss of hearing to certain degrees.
Genes are passed down so if someone in your family is an addict you're more likely to be.
